Android games will make like Steam with the upcoming Google Play Early Access.
It works exactly as you'd expect, with in-development titles marked as Early Access Apps.
Users of these apps will be able to send private feedback to the developer through the Play store listing.
According to Android Developers on Google+, Google Play Early Access will be "showcasing a hand-picked group of promising open betas that haven't gone to production yet."
Here's how it will look: